alsa_sound: Add support for separated speaker mic devices

* Some devices use a dedicated ambient mic for loudspeaker, and
  reject attempts at using DMIC for it even if regular earpiece
  mode uses it

Change-Id: I87201cb3ab81a345ac817c66ba35d22b075fcedc
Revert "alsa_sound: Fix CAMCORDER_TX use case"

This reverts commit 58bd771e0b626c5edc6dbb1bfc2df0518387f6d8,
cleaner fix coming up

Change-Id: I4042b699379dbf5a0b868cd978a45cc99d8f91ac
alsa_sound: Fix camcorder input selection

Change I1ddc6460a91752fd7673d84fd41b70365d83d90c was supposed to
address camcorder during calls, and ended up forcing the main mic
for every other use case. Don't do that.

Change-Id: I4ecc11de57603ec12d2f60e408469f90ef3696b9